(CNN) -- The Polish president on Saturday signed his country's ratification of the Lisbon Treaty, aimed at streamlining the workings of the European Union.

Polish President Lech Kaczynski holds the EU's Lisbon Treaty in Warsaw on October 10.

President Lech Kaczynski's approval of the treaty leaves the Czech Republic as the lone country that has not ratified the document.

Kaczynski signed the treaty at a ceremony attended by EU officials in Warsaw. He had refused to sign the document until it was ratified by Irish voters in a referendum. They backed it by a wide margin on October 2.

"I am certain that the union will function even better with the treaty of Lisbon," Kaczynski said Saturday, in an excerpt of his remarks provided by the Swedish presidency of the EU.

The treaty would create an EU president and foreign minister and introduce rotating representatives for member countries in the EU Commission, the union's executive branch.

All member states have to ratify the treaty before it can be adopted.

"The Czech Republic must conclude their ratification process by the signature of President Klaus. Europe is waiting impatiently," Swedish Prime Minister Fredrik Reinfeldt said, according to the Swedish presidency.

The Lisbon treaty is undergoing review in a Czech court, which will determine in a few weeks whether it is compatible with the nation's constitution.

Czech President Vaclav Klaus must also sign it.

On Friday, Klaus outlined his objections to the treaty, saying at a news conference that "the Lisbon Treaty constitutes a fundamental change for the Czech Republic.

"As you know, I have always considered this treaty a step in the wrong direction," he said. "It will increase its democratic deficit, worsen the standing of our country and expose it to new risks -- among other things also because it endangers the legal status of the citizens and the stability of property rights in our country," he said.

He said he was particularly concerned about one section of the treaty, called the Charter of Fundamental Rights of the European Union, which concerns fundamental human rights, including property rights, for EU citizens.